SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46b61464044b8959487c97c5b4b5d5619fb75150b6af7e29d3bd9a8db41c0b2' 
  AND token = 'Cdo3wzl8TqyRJmCTjA/ZuF5t1pMdHnZ1JHN+sMMwhfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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