SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01515f3f282d631c08769092eba49f8cc87517594f8f48fff83eb1d5c707d05c' 
  AND token = '/bD/7p95KzZtvnKFKhqGjS28mmKxAC1Dj+SFb6Ahx3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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