[sql] How do I view the Explain Plan in Oracle Sql developer?

I have few SQL queries which has very low query running performance and I want to check the query execution plan for this query. I am trying to execute the below query but its not showing any query execution plan. Its only display message plan FOR succeeded. I dont know is there any settings that we have to do in oracle sql developer to vies explain plan for query :

EXPLAIN PLAN FOR 
Select SO.P_OPTION_ID FROM
SIMSIM 
   JOIN P_TYPE PT on PT.KEY=SIM.P_TYPE_KEY JOIN P_CONFIG PC ON PC.ID=PT.PRODUCT_CONFIG_ID
JOIN P_OPTION PO ON PO.OPTION_KEY=PC.DEFAULT_PRODUCT_OPTIONS JOIN S_OPTION SO ON SO.SERVICE_ID=SIM.ASSIGNED_TO_SERVICE_ID
JOIN AVV_NO AN ON SIM.ASSIGNED_ANUMBER_ID = AN.ID
 where SO.STATUS_ID IN (20,40) 
 and SO.ID < to_char(SYSDATE - numtodsinterval (  1,'MINUTE' ), 'YYYYMMDDHH24MISS')||'0000'
 and SO.ID > to_char(SYSDATE - numtodsinterval (  1, 'HOUR' ), 'YYYYMMDDHH24MISS')||'0000'
and NOT EXISTS(SELECT ID from TEMP_BPL T WHERE T.ID = SO.ID );

Explain only shows how the optimizer thinks the query will execute.

To show the real plan, you will need to run the sql once. Then use the same session run the following:

@yoursql 
select * from table(dbms_xplan.display_cursor()) 

This way can show the real plan used during execution. There are several other ways in showing plan using dbms_xplan. You can Google with term "dbms_xplan".

We use Oracle PL/SQL Developer(Version 12.0.7). And we use F5 button to view the explain plan.