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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0f5942af68047a9033cc5e87cbe31192fbcc3e2802d9022c762e2dcfb1aabb' 
  AND token = '634HhWcvkY4GOuA7T5jqnvekDX7TXcOgqP1wTBX0qXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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