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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18f7c6ab8635cc7764bc803b66cf9b70b131aeeab414e6ace2ee69c5ef4a632' 
  AND token = '31bs2mH/Zv23Zrj+h05HnlJO1HCrbXHh55egcVollE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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