SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935cefa895bcfc24c896316f9944a795c69f741c798ffd7fa7249bc5a30104b0' 
  AND token = 'uXjmwmkscI10nvXygqdDVT/NDAPDtww0XC5pUjCBlYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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