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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93df826c7ebc57637dd0a92c888b4ec025ea73e953c3a2181e876e4f391718f' 
  AND token = 'kU5NPxuX9g+guw1ncwUfC9KzaaUshZ4aM7niTBGeSQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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