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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dae5a285211f9c6a4a65d65d54f92cddbd17da38bc07c23afea03956c960fd' 
  AND token = 'xFVl10WqAdk68du1yu9bFcR4YgkUyz8y5B6AnUxqkiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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