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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595099f161dbfbe61b0c6d9262bc71f7c9471c5f04c766181a56674501740871' 
  AND token = 'DWeUHo+3TR6JISa5jhWTLDa101sUSLfWvVIYhTINFqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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