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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39766328e16194970cec00fadf9954b8308593d102b385caf600489fb17aaad0' 
  AND token = 'CrgDBTW+5yjKy4GNJPX1v/oavAILTJb46h0TUEBKS+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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