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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1313314aa5d5a7dffadc0c7f9401ba36be0309ab8f6bbf6638d8fe1e56e3bf23' 
  AND token = 'ZyHXMa+xBqKEphpCK8lC86j5D6p3AKwVrZ8Djf48J74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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