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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201e4f9968ef62ca83c16534657c3acbbbe64607fb37cdf0a88671182f82af4f' 
  AND token = 'PSeoxwqgWDz37Tgm4seP8eKn3KtOZ8qhGiJ8f6Emr8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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