SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053f544abfd10faeea27a8ecfde39ee1812cf6a5317bda92b33b09790618744d' 
  AND token = '+jzoiHwMW2xjVGjU9VhhvPdGdg9kwvuxWuS/PlqgdPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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