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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c84ad0ea31c5e870313b15f9ebd2503a8b178cf90cd9c86741e6c4953e6452' 
  AND token = 'N1hTPg8XfHln1Hd2ah6OacJNNsXmcMknC5HS7gNLcRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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