SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2360292756399b2bce5b0bdff7336be897265087efc9c01ad314f4374b37cb3' 
  AND token = 'L/x/iDJB/8rt57VgckmuJqCfm0c0jd6NGbWAZPOwz9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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