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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b037d98c7f9f102cc9dc34c337b72d23265a70721891aed795fdfca1583fb919' 
  AND token = 'ddpsck1WCdf10xAqeAPt1K8K5V7u5XQX6fv5IbbMfXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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