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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5550e87a8b4536bcdbfb4c5bb41a43f3508407b654d145ffbb32b12f2919b2c6' 
  AND token = 'VnW0MLzM0lsv+Xisc5z6gfrWELjyWWnN/Ot9ZzQrNXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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