SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8470dfd9db8978a22be26033465d04b2a5ac960540820b06876b2dcca139fb' 
  AND token = '3RlrTsK7a7CM3VVubKlJIlqRG92T+0ZYXGP9MK15Eos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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