SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d0d25cf0979749f66b873d8efa29e661adf4c992adb24ad61ea99eb47c0a2c' 
  AND token = 'L4I3SIDVuWa2JuKnj/O5uI2S3AXrJpPEPDUNCawywNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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