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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910e37921ae1c0c8b7fed55fbb6be4f30a71670691f38b259f24b4de3c8cdff3' 
  AND token = 'TytNpXUA5ztuV7RyAgE9z785YNcJKw7tQ4PLZElTi5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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