Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bbfeb97fd2644dbf0cb379416852008915376dcadba276a2d4526d15a010df' 
  AND token = 'ZEAXlDktU9r4f0zwKwi1UvnfjhxwfbKlITjvowvwV34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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