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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af6b7d4cd29ad87a449f299c9eedb7c4dfde406eadd1e79ebc5f74e7a87ed6f' 
  AND token = 'YMc13ZXoCI/gfwI6IRLW5Cxqe4ThtgBUykeEBelO+EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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