SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7307db1283bdc17d3f342b248442570615185fb5a6bf8c92675d79a03ed528c' 
  AND token = '/hPXJ6i4hjcfovf/TJ1K4S3GGuGn238Y9xQ2bvZKpss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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