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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bef1dc6b9611556a5ef77a4bad88c7c8c174588c7bd0d316ab060574796b9d' 
  AND token = 'BlwAGH7D5G6UJO7sEsRC2VOclqGykzl53bHoiIPF1dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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