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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3263972c311b50fc3de4bd538cc7a9b22baee09ab46fca1fdb89213d8b0fae9d' 
  AND token = '9TQggkUMuEzT6vvDejQr6qnaHuVh+n6VuOXwYdiHU8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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