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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf4bd07b44fd9b89f1ebc2213d488314d08e0bafb47c07760244a3354eee9d2' 
  AND token = 'iT8PZRlkOqYutLD/ZZm7Uwo7MtVYEzY83HQ0XfHJNjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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