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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637013fb8a1d88dd340a4ca8b3a6b99144e826d8f793735e4342645b78a4d0ca' 
  AND token = 'aNYIEnlXuu+t8R27T20Kg+B84GvIcKR7k4l7ZlMo18M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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