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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2929f8ada8bae515f685fec86b3e9188dab82c930719e53e3d6f169a27044094' 
  AND token = 'oF0M8HBdBdWDJi7eZIeL9Q5ufR5CpRzXMLLnAj6ISf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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