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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3eaa45c3dd2ea0637c9f783b2bda72a9c0f8d8b20d7dea00067c1ee809dd5af' 
  AND token = '3s63ua6HYsIQvTFkHYcCBD9lGHJaVS3gQqIX2UWZ7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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