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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924443061907e782991ce42f35d5db08bc77904b0bf036abb5b5680183cb0188' 
  AND token = '5q91oByON9LxY+RWJpj1YIl3ieoCbEoKQiAAAba4A9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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