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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3de487ff83c3997d505b3f4492cef77c83fdaa1b0d9ed8b80fe22a4b024067' 
  AND token = 'kXD+ovPKa4MqzBGdNdffjtM/C3HrNu9LhrD9KDEkkF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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