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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04566b14f0dced90d07b8ce9c92e281d691c8edcc89aa40b73f52867c25b55f' 
  AND token = '6rMudqz62LIsOED3h3qu7PmriftON1FHf6OokRtuAZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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