SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f95a52272c2015199eee80b475026aad9315363f2ce918f321a8d9b93f57605' 
  AND token = 'yeaGH9+uU628V7mSCywSTsKhZKte3YC2/BkqYqm0lj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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