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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3947462a49d6d1e1be1224cdd3a59512b89f541afc13ddb7e755098c58fafa18' 
  AND token = '3n6arcQ+i56PjhWpy8HU800vk5ePs7vCCJd4NSj8gck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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