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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c7a3aae4c44b6d0a4a50a3038deb6aeb505a0ebff8635fe00e7351931c6402' 
  AND token = 'qS+3JQqXwigN0BCXLFWpl+ape8KzXAqJOhLwjkB7VS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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