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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2e1a9c54ce7155037045f01961cdef549af1b9b19f926e687af16f9cf2079f' 
  AND token = 'RjCbUMz0DKOYm+pvc9FTum4gut3ln7HR9sfitIfD33M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}