Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d606410a203c2e70626661c358b35848875f9e056a34989705eb3e61ad3bff' 
  AND token = 'sQguMmHwNy9MjeO5NH4IhxboIUPX17sAdolWeogvqFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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