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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bf866e456b23b2d4b3aa47397bef05d74f82f303732e350aeeb878862de215' 
  AND token = 'dVsNeEriGbn0TZoQu2u9i/Hu/Or9upVfLAvNNKCB8w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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