tente isso no SQL Developer:
SELECT * FROM TABLE1 WHERE NAME LIKE 'test\_1%' escape '\'
em sql mais:
set escape '\'
SELECT * FROM TABLE1 WHERE NAME LIKE 'test\_1%';
SELECT * FROM TABLE1 WHERE NAME LIKE 'test\_1%' escape '\'
set escape '\'
SELECT * FROM TABLE1 WHERE NAME LIKE 'test\_1%';