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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff70bb55af4c7f3b05ee8d225d8dec0f52b7ccc22876981426bd2573a26a944' 
  AND token = 'SQMNedP64YjF0jLEugDJe6sc2Byo4qfXgYBM7KvfejU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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