Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168285539653406ec2950ccdb5edfed8b9355d4f408b4044350f3c324cace4cd' 
  AND token = 'N9aKsqjRC0W5mp4wf5P5cpsIzs7meVyQ1KNVITwkIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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