SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd558f8b2606cfdb0029229b4d0dc8fd707f8f38782396ca781444e6f4496c4c2' 
  AND token = 'JJGQj2ND/BAoaCAMKsU2kwF4+/V/5In3UHNVly1oFp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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