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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7e6110c45faa23ee2e86ed17e652f44aeba0e4c0dc57791e8a56bb909f20f1' 
  AND token = 'tQNV08P8FLBP7XWCGgOLII0CD9STp1jsuVtYn6t+UxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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