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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7152b85d0ee4c6088cd824ed4c21c8d90af764148a39ecdfe8422bb6faba679' 
  AND token = 'ediI5TdWmDNHY8cobOEgv+u+jCBw2IfqhX2FxRK7P08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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