> is that session using "autocommit" mode?  
>

print("--> autocommit", dbsession.autocommit) gives a False.
 

> it looks like the error is raised on the UNLOCK ? 


 When I comment out the UNLOCK, the exception still raises. Here is SQLA’s 
verbose logging:

--> autocommit False
2017-12-07 11:23:52,101 INFO  [sqlalchemy.engine.base.Engine][MainThread] 
LOCK TABLES tokens WRITE
2017-12-07 11:23:52,101 INFO  [sqlalchemy.engine.base.Engine][MainThread] {}
2017-12-07 11:23:52,102 INFO  [sqlalchemy.engine.base.Engine][MainThread] 
INSERT INTO tokens (id, user_id, client_sig) SELECT '84…20', '39…30', 
'0b…87' 
FROM dual 
WHERE NOT (EXISTS (SELECT * 
FROM tokens 
WHERE tokens.user_id = %(user_id_1)s AND tokens.client_sig = 
%(client_sig_1)s))
2017-12-07 11:23:52,102 INFO  [sqlalchemy.engine.base.Engine][MainThread] 
{'user_id_1': '39…30', 'client_sig_1': '0b…87'}
2017-12-07 11:23:52,103 ERROR [srv.views.exceptions][MainThread] Internal 
server error detected, stacktrace follows.


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