Connected to:
SQL>
SQL>
SQL>
SQL> select 1 from gv$locked_object a where object_id = 189035;

         1
----------
         1
         1

SQL>

SQL> select 1
  2    from gv$locked_object a
  3   where exists (select 1
  4            from gv$transaction c
  5           where a.xidusn = c.xidusn
  6             and a.xidslot = c.xidslot)
  7     and a.object_id = 189035
  8     and exists
  9   (select 1 from dba_objects b where b.OBJECT_ID = a.object_id)
 10  ;

         1
----------
         1

SQL> select 1
  2    from gv$locked_object a, gv$transaction c, dba_objects b
  3   where a.xidusn = c.xidusn
  4     and a.xidslot = c.xidslot
  5     and a.object_id = 189035
  6     and b.OBJECT_ID = a.object_id;

no rows selected

SQL>

SQL> lock table table1 in exclusive mode;

Table(s) Locked.

SQL> select 1 from table1 for update;

         1
----------
         1
         1
         1
         1
         1
         1
         1
         1

8 rows selected.

SQL>
SQL> select 1
  2    from gv$locked_object a, gv$transaction c, dba_objects b
  3   where a.xidusn = c.xidusn
  4     and a.xidslot = c.xidslot
  5     and a.object_id = 241566
  6     and b.OBJECT_ID = a.object_id;

         1
----------
         1

SQL>
SQL>
SQL> select 1
  2    from gv$locked_object a
  3   where exists (select 1
  4            from gv$transaction c
  5           where a.xidusn = c.xidusn
  6             and a.xidslot = c.xidslot)
  7     and a.object_id = 241566
  8     and exists
  9   (select 1 from dba_objects b where b.OBJECT_ID = a.object_id);

         1
----------
         1

SQL>
SQL>

SQL> drop table bogus
>> drop table bogus
Error at line 3
ORA-00942: table or view does not exist

SQL> create table bogus as select * from dba_objects
Table created.
SQL> select count(*) from bogus

  COUNT(*)
----------
    134719
1 row selected.
SQL> lock table bogus in exclusive mode
Lock complete.
SQL> select object_id,data_object_id from user_objects where object_name='BOGUS'

 OBJECT_ID DATA_OBJECT_ID
---------- --------------
   2849099        2849099
1 row selected.
SQL> select * from gv$locked_object where object_id = 2849099

   INST_ID     XIDUSN    XIDSLOT     XIDSQN  OBJECT_ID SESSION_ID ORACLE_USERNAME                OS_USER_NAME                   PROCESS                  LOCKED_MODE
---------- ---------- ---------- ---------- ---------- ---------- ------------------------------ ------------------------------ ------------------------ -----------
         1          0          0          0    2849099       1722 ***** ****** 10100:3044                         6
1 row selected.
SQL> SELECT 1
  FROM gv$locked_object a
 WHERE     EXISTS
              (SELECT 1
                 FROM gv$transaction c
                WHERE a.xidusn = c.xidusn AND a.xidslot = c.xidslot)
       AND a.object_id = 2849099
       AND EXISTS
              (SELECT 1
                 FROM dba_objects b
                WHERE b.OBJECT_ID = a.object_id)
no rows selected.