SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd0525f13c28a6213be8c726a0cf4453a1e5de094ffe77b987a9ecf4840a466' 
  AND token = 'uxf0IxZW2v4xJv5+hHYhmvh28zSQCsu2rwSl/BaX6i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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