SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6d249c56f7a929af14ea4819857db74a59ca1ec7a52c3a75360fb267384ff1' 
  AND token = 'pHLR8h0okrB23BshJFQZegPwzwjQp2dulRzo6ZMQ2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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