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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d9f1ca5fc4c3359cf0239affc48004b0ebe6d7df9e33bd7563482d4ced3e2e' 
  AND token = 'YBuI+4UC61Fbzq5i5VLvqrxa0hT1jXWdDvzI8Nq491Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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