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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd460b399e69a4f6dc7c875ebc48f54c0f03eeab4abd8f465a2a51805e1b7790c' 
  AND token = 'PPwlv8BMqapcWT9Bgk10M2FQGCE7xj8TYe66hBJwjMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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