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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d006eb02e52fa108f3dc8a10769781c78b869caf1ffaaa472e1b9ad9fa59fc4' 
  AND token = '0vZnWxwNcXMYysMbagmh4iduLx0RoJw6Fg0fiia0rLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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