SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e22fe9ae85cb575cb35a404e26e546fcd7db3929338929845f7e4178710d099' 
  AND token = 'BquVAZFy8jAJnGGY5Sb+/73iKuPV0pJSgNXmDkcA5ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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