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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a670e22b1959b2763efb170d46e7ca529e19d2e17d058c785ec822871cd2f1c2' 
  AND token = '0h9lPNtPF7WxIlLwb0FLFdjLl4h67qW+HUzREwiWwMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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