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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc94345e499faa17897e10b6a61caf703601a2052b2d3e230247689597609e40' 
  AND token = 'uvlJMvAaPvFTu8AHmGMWnJ3JmE1db5TQTPLJr7cGN+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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