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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3362ee1e3885a56b13b7c389cdfc84262e61fd92f5a7ced68f060a515935f52b' 
  AND token = 'z71IZIydUbC8YGBBOMbgyYw+rrGGzavJl3ElDA0UI5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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