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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285de0e5eec1e5a7a62de10bcbe6c56d015ac6c412b5cc3e2c988d6fef069e76' 
  AND token = 'P8raufFFZ6gmfe6nwOPxDJXMroa4KI5MpxLk5+21g8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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