SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd989f6fc4cf5a061285da20687a47ec6937d14ba48ea2b317f37a3a4044b090a' 
  AND token = 'NmDY4vZ3u3m9Vhf9CBqvuyGXobgF//XRhIGcNCyyGbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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