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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d06b4776e2b96c4bfc24f11ecf5f13c3d3adb1050ed9db5b8c2ac62ce36c24b' 
  AND token = 'uzNbN4zEmn0zc0qpZz5CKcI+DV/Xd0TuhuvMQfmGcrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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