SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5f331cd3f45210061788a6e0efd9bc518249569be0b09410f099cf1c76203d' 
  AND token = 'HZzo1FyFUmw3cQg7bTH9CjM7IYfqaG2/HyZZKJvgSxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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