Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c57af8dd03e0c4954857fef90a17c8aa997ee02d1714107dfdc78288829a91' 
  AND token = 'SLCgrJ/rPntsG5clHm5WsIrguhq9IlJRpv1mFArZ280=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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