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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9867b943fd7b6b8a30ba8408af0513105fc4166a69455e93c36d8cdbe597ed87' 
  AND token = '6dOWLffLzZxS0RyFCS0Tqx4ZW1+kTfRVn6p4QyNcOG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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