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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6026986176e52b2058ff0409829a35b429b6f37a23724215b603f45a25866366' 
  AND token = 'm+AVutF7QbI+2MFFBAUvSvv63kIy05GDx0UvOaJUu54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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