SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325692a5d584e2f8716a82223fd2f32c0e0abd99b029a418e1bb9be92f67752c' 
  AND token = 'ujIK4ZDY0gLWMydpPn5XB9Ud8/czZulw8nhVmHrVeQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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