SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5fa140bc7027374c987d96d7d24a6d3dc263b5d5666593bb3aa4f623ec430c' 
  AND token = '3+7Qk9qrXdGOkEsXJszc44CoT7083PrgBe2exwrrbus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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