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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1832bc5c636b8ca1368a7c35cecc9f3cda47755a353f0372e43d06f01c50d12b' 
  AND token = '11ATNUlKDFLLNf5lkZalBoZU2SaQ240lXBKTxk8VxEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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