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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee16c7b43e77091ca9673d9713e30bfb64489748f4d324d1241720fc97e05b1' 
  AND token = '8X0uLqh7lX1msEXs23CvglXY1V9Eo0xA4HSDdYvjefw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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