Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf2fcaa0982e0f03429c1214075d4978c3987e08bf7e917378dbe4c632a80e7' 
  AND token = '9nLwiKYx9UVyUeiF+EBtxkS8HgMC2qM5OZfzIIlo7mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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