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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e1a9eb7e0bc35de0761e4700f8e5ff345b575553e1258d32d9efc65ca61008' 
  AND token = 'O/E2t7RQ0wt6Ytds+DTu0jpChw5ozxP6TIf1HjRsDOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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