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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d69ff42e3687009761fe5b0ae1eecb49d2532d9514165f2821e140dcf95a3a4' 
  AND token = 'WfQnTdK7xcrTwAa7csEpekcRAQig+cQJ76QdF1ULwy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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