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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b18e0bda7ad7395de501cab08d577fc94423b44805817965d90f979f603bb11' 
  AND token = 'mxJtqy8cpkSog7RKvWlte6aKkJ7/yPx5Lw1WL+OwDgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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