Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e43d699aa57a0070c01bb3faa1e39a2c2625b89f4ce751cd208d197e63601a9' 
  AND token = 'MLW3T3TR9SlZdOrx2h1NPocLIjyH5d8tqYAJ2tIsiHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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