SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6364d4523129eadf6d02a3a6501e7108981f636b07bfab99725b7fe2ae457f' 
  AND token = 'hjMEjQqwpcOp20qrvFGttbX7Qu6F2ntoERkJZo7dHK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables