How to find locked object query?

There is random error ORA-00054 coming during execution of one process which is using SELECT FOR UPDATE NO WAIT statement.
Logs of process is showing row is accessed only once but still it gets error of "resource busy".
So there must be any other session which is locking object and it is not identifid. I want to identify which other session/user is locking object.
I am trying with below query which shows session id, terminal name and object name which is locked.
SELECT a.sid,a.serial#, a.username,c.os_user_name,a.terminal,
b.object_id,substr(b.object_name,1,40) object_name,sysdate
from v$session a, dba_objects b, v$locked_object c
where a.sid = c.session_id
and b.object_id = c.object_id But i want information of SQL query from v$sqltext so i can find out throughout the applicaiton where it is executed?
Thanks

Finding session that it locking is not a problem.
Finding SQL responsible is not necessarily straightforward.
You might be lucky. You might not.
If the SQl responsible for locking the row ran for a long time or was blocked by something else, AND you're on version >= 10g AND you're licensed for Diagnostic Pack, then you should find some evidence in ASH - DBA_HIST_ACTIVE_SESS_HISTORY.
Doug Burns has a 10-part series on the subject.
http://oracledoug.com/serendipity/index.php?/archives/1477-Diagnosing-Locking-Problems-using-ASH-Part-1.html
There is another current thread on the same issue:
How to find sql statement which generates LOCK

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